Scale jpeg while loading.

Cargo.toml

@@ -15,7 +15,7 @@ chrono = "0.4.0" # Must match version used by diesel
 dotenv = "0.15"
 env_logger = "0.7.1"
 flate2 = "1.0.14"
-image = "0.23.0"
+image = "0.23.11"
 medallion = "2.3.1"
 kamadak-exif = "0.5.0"
 libc = "0.2.68"

src/photosdir.rs

@@ -128,7 +128,17 @@ pub async fn get_scaled_jpeg(
 ) -> Result<Vec<u8>, ImageLoadFailed> {
     spawn_blocking(move || {
         info!("Should open {:?}", path);
-        let img = image::open(path)?;
+
+        let img = if is_jpeg(&path) {
+            use std::fs::File;
+            use std::io::BufReader;
+            let file = BufReader::new(File::open(path)?);
+            let mut decoder = image::jpeg::JpegDecoder::new(file)?;
+            decoder.scale(size as u16, size as u16)?;
+            image::DynamicImage::from_decoder(decoder)?
+        } else {
+            image::open(path)?
+        };
 
         let img = if 3 * size <= img.width() || 3 * size <= img.height() {
             info!("T-nail from {}x{} to {}", img.width(), img.height(), size);
@@ -155,3 +165,12 @@ pub async fn get_scaled_jpeg(
     })
     .await?
 }
+
+fn is_jpeg(path: &Path) -> bool {
+    if let Some(suffix) = path.extension().and_then(|s| s.to_str()) {
+        suffix.eq_ignore_ascii_case("jpg")
+            || suffix.eq_ignore_ascii_case("jpeg")
+    } else {
+        false
+    }
+}